My Spanish friends approached me a while ago about republishing my articles in Spanish. After some back-and-forth I agreed - and I'm happy with the result.
Spanish is the second-largest language of the world. Wikipedia says:
Spanish has 417 million including second-language speakers (Ethnologue 1999). 500 million currently. It is also one of the six official languages of the United Nations.
I hope this will mean even more people will learn about Joomla. Reading the articles in their native language will definitely make it easier to understand the many facets of Joomla.